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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract] |
Employee Benefit Plans | Note 19. Employee Benefit Plans Dominion Energy The components of Dominion Energy’s provision for net periodic benefit cost (credit) were as follows:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three Months Ended September 30, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 39 |  |  | $ | 35 |  |  | $ | 7 |  |  | $ | 7 |
Interest cost |  |  | 85 |  |  |  | 86 |  |  |  | 14 |  |  |  | 15 |
Expected return on plan assets |  |  | (165 | ) |  |  | (160 | ) |  |  | (36 | ) |  |  | (32 | )
Amortization of prior service cost (credit) |  |  | — |  |  |  | — |  |  |  | (13 | ) |  |  | (13 | )
Amortization of net actuarial loss |  |  | 48 |  |  |  | 40 |  |  |  | 3 |  |  |  | 3 |
Settlements |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | — |
Net periodic benefit cost (credit) |  | $ | 7 |  |  | $ | 2 |  |  | $ | (25 | ) |  | $ | (20 | )
Nine Months Ended September 30, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 118 |  |  | $ | 104 |  |  | $ | 20 |  |  | $ | 20 |
Interest cost |  |  | 253 |  |  |  | 259 |  |  |  | 42 |  |  |  | 45 |
Expected return on plan assets |  |  | (498 | ) |  |  | (480 | ) |  |  | (107 | ) |  |  | (95 | )
Amortization of prior service cost (credit) |  |  | 1 |  |  |  | 1 |  |  |  | (39 | ) |  |  | (38 | )
Amortization of net actuarial loss |  |  | 145 |  |  |  | 121 |  |  |  | 8 |  |  |  | 9 |
Settlements |  |  | — |  |  |  | 2 |  |  |  | — |  |  |  | — |
Net periodic benefit cost (credit) |  | $ | 19 |  |  | $ | 7 |  |  | $ | (76 | ) |  | $ | (59 | )
Employer Contributions During the nine months ended September 30, 2018, Dominion Energy made no contributions to its defined benefit pension plans or other postretirement benefit plans. Dominion Energy expects to contribute approximately $12 million to its other postretirement benefit plans through VEBAs during the remainder of 2018. Dominion Energy Gas Dominion Energy Gas participates in certain Dominion Energy benefit plans as described in Note 21 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2017, as updated in Current Report on Form 8-K, filed June 6, 2018. See Note 18 for more information. The components of Dominion Energy Gas’ provision for net periodic benefit cost (credit) for employees represented by collective bargaining units were as follows
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Three Months Ended September 30, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 4 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 7 |  |  |  | 7 |  |  |  | 3 |  |  |  | 3 |
Expected return on plan assets |  |  | (36 | ) |  |  | (34 | ) |  |  | (7 | ) |  |  | (7 | )
Amortization of prior service credit |  |  | — |  |  |  | — |  |  |  | (1 | ) |  |  | (1 | )
Amortization of net actuarial loss |  |  | 4 |  |  |  | 4 |  |  |  | — |  |  |  | 1 |
Net periodic benefit credit |  | $ | (21 | ) |  | $ | (20 | ) |  | $ | (4 | ) |  | $ | (3 | )
Nine Months Ended September 30, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 13 |  |  | $ | 11 |  |  | $ | 3 |  |  | $ | 3 |
Interest cost |  |  | 21 |  |  |  | 22 |  |  |  | 8 |  |  |  | 9 |
Expected return on plan assets |  |  | (111 | ) |  |  | (105 | ) |  |  | (21 | ) |  |  | (19 | )
Amortization of prior service credit |  |  | — |  |  |  | — |  |  |  | (3 | ) |  |  | (2 | )
Amortization of net actuarial loss |  |  | 14 |  |  |  | 12 |  |  |  | 2 |  |  |  | 2 |
Net periodic benefit credit |  | $ | (63 | ) |  | $ | (60 | ) |  | $ | (11 | ) |  | $ | (7 | )
Employer Contributions During the nine months ended September 30, 2018, Dominion Energy Gas made no contributions to its defined benefit pension plans or other postretirement benefit plans. Dominion Energy Gas expects to contribute approximately $12 million to its other postretirement benefit plans through VEBAs, for both employees represented by collective bargaining units and employees not represented by collective bargaining units, during the remainder of 2018.

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